If you want WiFi access in the UEFi environment, you will need to write a WiFi UEFI driver for the brcm80211 wireless controller and submit it to edk2-platforms for review, in the same manner as what was done for the Ethernet (Genet) driver.
I'm afraid that unless someone invests time to write a driver, you will not have wireless access in UEFI.
If you want WiFi access in the UEFi environment, you will need to write a WiFi UEFI driver for the brcm80211 wireless controller and submit it to edk2-platforms for review, in the same manner as what was done for the Ethernet (Genet) driver.
I'm afraid that unless someone invests time to write a driver, you will not have wireless access in UEFI.